Sadly this service will be / was terminated as of March, 2020. Alternative Freedb server ~ http://freedb.dbpoweramp.com/
freedb is a free CD and music database service to look up textual metadata about music, audio or data CDs. This is done by a client which queries the freedb database. As a result, the client displays the artist, CD title, track list and some additional information. Clients are for example CD players, CD rippers and CD burning software.